package main 

import "fmt"

func main(){
  var m1 map[int]string  

  _ = m1
  // 初始化
  m2 := map[int]string {1 : "mike"  , 2 : "yoyo"}

  m2[5] = "FAKER"

  value , ok := m2[3]

  fmt.Println(value , ok)
}
